40 PARTULINA, LANAI. 



pale brownish ground, the spire white, becoming fleshy above 

 (pi. 7, fig. 12). 



Another form (no. 2068, Cooke coll. ) has a snow-white spire 

 and coffee-colored last whorl, aperture pink within, lip brown 

 (pi. 7, fig. 16). 



In some examples there is a sutural margin banded by an 

 impressed line, as in P. proximo, schauinslandi. This is probably 

 a local race. 



The color-forms of A. redfteldii may be arranged thus: 

 A. Uniform dark or light brown with a white sutural border. 

 Ab. The same, with darker spiral bands. 



a. Yellowish-brown with narrow streaks of darker 



brown along growth lines. 



ab. The same cut by white or whitish spiral bands. 

 b. White predominating, leaving only traces of dark 



bands or none. 



To what extent these patterns mingle in the same colony is 

 not known to me. 



SPECIES OF LANAI. 

 16. P. CRASSA (Newcomb). PI. 18, figs. 1, 2. 



The shell is usually dextral, narrowly umbilicate, acutely 

 ovate-conic, solid, chestnut (the shade varying) with zigzag 

 lines, dots and streaks of a whitish tint, and a white zone below 

 the periphery; spire typically a little attenuated above, the whorls 

 scarcely convex. Surface dull or slightly glossy, closely and 

 rather deeply engraved with spiral lines. Suture scarcely im- 

 pressed. Aperture ovate, the lip expanded, sometimes almost 

 reflected, white, very strongly thickened within, the callous 

 usually irregular. Columellar lamella obtuse but rather strong. 

 Columellar lip built forward, reflected. 



Length 20, diam. 14 mm.; 6J whorls (typical). 



Length 18, diam. 13 mm. 



Length 19, diam. 12 mm. 



Length 22, diam. 14 mm. 



Lanai (Newcomb); near Koela (Perkins). 



Achatinetta crassa NEWC., P. Z. S. 1853, p. 155, pi. 24, f. 71 



